Method for operating injectors of an injection system
The present disclosure provides a method for operating injectors of an injection system, which has a pressure accumulator (rail), of an internal combustion engine, in which needle movement of the injectors is controlled directly by way of an actuator. The method may comprise: determining an actual injection quantity of each injector of the injection system via a fuel quantity which is requested at a pump of the injection system for each injector for a predefined time period or via a pressure loss in the pressure accumulator, the pressure loss brought about by way of the injection operation; comparing the determined actual fuel quantity with a setpoint fuel quantity; and if a deviation is determined in an injector, carrying out an open/closed loop control method for reducing/eliminating the determined deviation.
1. A method for operating injectors of an injection system including a pressure accumulator, of an internal combustion engine, the method comprising:
directly controlling needle movement of the injectors with respective actuators;
correcting a deviation in at least one of an opening time or a closing time of one of the injectors using a closing time regulation of the one of the injectors by comparing the opening time or the closing time with a corresponding setpoint value;
determining an actual injection quantity of each injector of the injection system via a fuel quantity which is requested at a pump of the injection system for each injector for a predefined time period or via a pressure loss in the pressure accumulator, the pressure loss brought about by way of individual injections;
comparing the determined actual fuel quantity with a setpoint fuel quantity; and
if a remaining deviation is determined in an injector, carrying out a correction by adapting an actuation duration or an energization of the actuator to reduce the determined deviation.
2. A method for operating an internal combustion engine comprising injectors and, a pressure accumulator, the method comprising:
directly controlling needle movement of the injectors with respective actuators;
correcting a deviation in at least one of an opening time or a closing time of a particular injector by regulating the closing time based on a comparison of the opening time or the closing time with a corresponding setpoint value;
determining an actual injection quantity of each injector of the injection system via a fuel quantity requested at the pump of the injection system for each injector for a predefined time period or via the pressure loss in the pressure accumulator brought about by individual injection operations;
calculating a mean value or a median value based on the determined actual injection quantities;
comparing the determined actual injection quantity among the injectors of the injection system, including comparing all deviations of individual injection quantities from the mean value or the median value; and
if a remaining deviation is determined in an injector, carrying out a correction by adapting an actuation duration or an energization of the actuator to recalibrate the particular injector.
3. The method as claimed in claim 1 , further comprising determining whether a magnitude of a particular deviation exceeds a correctable maximum value.
4. The method as claimed in claim 1 , wherein the method is carried out as an on-board diagnosis during normal operation of the internal combustion engine.
5. A method for operating injectors of an injection system including a pressure accumulator, of an internal combustion engine, the method comprising:
directly controlling needle movement of the injectors with respective actuators;
correcting a deviation in the closing time of an injector via regulating the closing time of the respective injector, and
correcting any remaining deviation by:
determining an actual injection quantity of each injector of the injection system via a fuel quantity which is requested at a pump of the injection system for each injector for a predefined time period or via a pressure loss in the pressure accumulator, the pressure loss brought about by way of individual injections;
comparing the determined actual fuel quantity with a setpoint fuel quantity; and
if a deviation is determined in an injector, carrying out an open or a closed loop control method to reduce the determined deviation.
6. The method as claimed in claim 2 , further comprising determining whether a magnitude of a particular deviation exceeds a correctable maximum value.
7. The method as claimed in claim 2 , wherein the method is carried out as an on-board diagnosis during normal operation of the internal combustion engine.